Sure thing, let's get straight to it. We start with 243 and we're going to multiply it by 45, which means adding 243 to itself 45 times.
Step 1: 0 + 243 = 243
Step 2: 243 + 243 = 486
Step 3: 486 + 243 = 729
Step 4: 729 + 243 = 972
Step 5: 972 + 243 = 1215
Step 6: 1215 + 243 = 1458
Step 7: 1458 + 243 = 1701
Step 8: 1701 + 243 = 1944
Step 9: 1944 + 243 = 2187
Step 10: 2187 + 243 = 2430
Step 11: 2430 + 243 = 2673
Step 12: 2673 + 243 = 2916
Step 13: 2916 + 243 = 3159
Step 14: 3159 + 243 = 3402
Step 15: 3402 + 243 = 3645
Step 16: 3645 + 243 = 3888
Step 17: 3888 + 243 = 4131
Step 18: 4131 + 243 = 4374
Step 19: 4374 + 243 = 4617
Step 20: 4617 + 243 = 4860
Step 21: 4860 + 243 = 5103
Step 22: 5103 + 243 = 5346
Step 23: 5346 + 243 = 5589
Step 24: 5589 + 243 = 5832
Step 25: 5832 + 243 = 6075
Step 26: 6075 + 243 = 6318
Step 27: 6318 + 243 = 6561
Step 28: 6561 + 243 = 6804
Step 29: 6804 + 243 = 7047
Step 30: 7047 + 243 = 7290
Step 31: 7290 + 243 = 7533
Step 32: 7533 + 243 = 7776
Step 33: 7776 + 243 = 8019
Step 34: 8019 + 243 = 8262
Step 35: 8262 + 243 = 8505
Step 36: 8505 + 243 = 8748
Step 37: 8748 + 243 = 8991
Step 38: 8991 + 243 = 9234
Step 39: 9234 + 243 = 9477
Step 40: 9477 + 243 = 9720
Step 41: 9720 + 243 = 9963
Step 42: 9963 + 243 = 10206
Step 43: 10206 + 243 = 10449
Step 44: 10449 + 243 = 10692
Step 45: 10692 + 243 = 10935

So, 243*45 = 10935